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Finding the Fourth Proportional to 354,391.16, 531,430.77 and 129,693.20

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Solution

The fourth proportional to 354,391.16, 531,430.77 and 129,693.20 is: 194,482.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,391.16 : 531,430.77 = 129,693.20 : x
  2. Step 2: Convert to fraction form
    354,391.16/531,430.77 = 129,693.20/x
  3. Step 3: Cross multiply
    354,391.16x = 531,430.77 × 129,693.20
  4. Step 4: Simplify right side
    354,391.16x = 68,922,957,139.76
  5. Step 5: Solve for x
    x = 68,922,957,139.76/354,391.16
  6. Step 6: Final answer
    x = 194,482.72

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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.