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Finding the Fourth Proportional to 571,132.80, 856,699.20 and 438,422.40

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Solution

The fourth proportional to 571,132.80, 856,699.20 and 438,422.40 is: 657,633.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    571,132.80 : 856,699.20 = 438,422.40 : x
  2. Step 2: Convert to fraction form
    571,132.80/856,699.20 = 438,422.40/x
  3. Step 3: Cross multiply
    571,132.80x = 856,699.20 × 438,422.40
  4. Step 4: Simplify right side
    571,132.80x = 375,596,119,342.08
  5. Step 5: Solve for x
    x = 375,596,119,342.08/571,132.80
  6. Step 6: Final answer
    x = 657,633.60

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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.