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Finding the Fourth Proportional to 42,358.80, 58,531.32 and 30,401.40

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Solution

The fourth proportional to 42,358.80, 58,531.32 and 30,401.40 is: 42,008.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,358.80 : 58,531.32 = 30,401.40 : x
  2. Step 2: Convert to fraction form
    42,358.80/58,531.32 = 30,401.40/x
  3. Step 3: Cross multiply
    42,358.80x = 58,531.32 × 30,401.40
  4. Step 4: Simplify right side
    42,358.80x = 1,779,434,071.85
  5. Step 5: Solve for x
    x = 1,779,434,071.85/42,358.80
  6. Step 6: Final answer
    x = 42,008.60

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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.