Home / 686,921.47-947,331.11-428,822.24

Finding the Fourth Proportional to 686,921.47, 947,331.11 and 428,822.24

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Solution

The fourth proportional to 686,921.47, 947,331.11 and 428,822.24 is: 591,387.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,921.47 : 947,331.11 = 428,822.24 : x
  2. Step 2: Convert to fraction form
    686,921.47/947,331.11 = 428,822.24/x
  3. Step 3: Cross multiply
    686,921.47x = 947,331.11 × 428,822.24
  4. Step 4: Simplify right side
    686,921.47x = 406,236,644,947.29
  5. Step 5: Solve for x
    x = 406,236,644,947.29/686,921.47
  6. Step 6: Final answer
    x = 591,387.32

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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.