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Finding the Fourth Proportional to 457,615.40, 686,423.10 and 426,511.40

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Solution

The fourth proportional to 457,615.40, 686,423.10 and 426,511.40 is: 639,767.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,615.40 : 686,423.10 = 426,511.40 : x
  2. Step 2: Convert to fraction form
    457,615.40/686,423.10 = 426,511.40/x
  3. Step 3: Cross multiply
    457,615.40x = 686,423.10 × 426,511.40
  4. Step 4: Simplify right side
    457,615.40x = 292,767,277,373.34
  5. Step 5: Solve for x
    x = 292,767,277,373.34/457,615.40
  6. Step 6: Final answer
    x = 639,767.10

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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.