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Finding the Fourth Proportional to 502,408.20, 753,612.30 and 128,411.40

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Solution

The fourth proportional to 502,408.20, 753,612.30 and 128,411.40 is: 192,617.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    502,408.20 : 753,612.30 = 128,411.40 : x
  2. Step 2: Convert to fraction form
    502,408.20/753,612.30 = 128,411.40/x
  3. Step 3: Cross multiply
    502,408.20x = 753,612.30 × 128,411.40
  4. Step 4: Simplify right side
    502,408.20x = 96,772,410,500.22
  5. Step 5: Solve for x
    x = 96,772,410,500.22/502,408.20
  6. Step 6: Final answer
    x = 192,617.10

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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.