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Finding the Fourth Proportional to 657,607.12, 907,400.56 and 399,349.76

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Solution

The fourth proportional to 657,607.12, 907,400.56 and 399,349.76 is: 551,043.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,607.12 : 907,400.56 = 399,349.76 : x
  2. Step 2: Convert to fraction form
    657,607.12/907,400.56 = 399,349.76/x
  3. Step 3: Cross multiply
    657,607.12x = 907,400.56 × 399,349.76
  4. Step 4: Simplify right side
    657,607.12x = 362,370,195,859.87
  5. Step 5: Solve for x
    x = 362,370,195,859.87/657,607.12
  6. Step 6: Final answer
    x = 551,043.60

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.