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Finding the Fourth Proportional to 861,796.80, 1,292,695.20 and 488,548.80

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Solution

The fourth proportional to 861,796.80, 1,292,695.20 and 488,548.80 is: 732,823.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,796.80 : 1,292,695.20 = 488,548.80 : x
  2. Step 2: Convert to fraction form
    861,796.80/1,292,695.20 = 488,548.80/x
  3. Step 3: Cross multiply
    861,796.80x = 1,292,695.20 × 488,548.80
  4. Step 4: Simplify right side
    861,796.80x = 631,544,688,725.76
  5. Step 5: Solve for x
    x = 631,544,688,725.76/861,796.80
  6. Step 6: Final answer
    x = 732,823.20

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.