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Finding the Fourth Proportional to 72,981.80, 109,464.60 and 59,811.20

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Solution

The fourth proportional to 72,981.80, 109,464.60 and 59,811.20 is: 89,710.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,981.80 : 109,464.60 = 59,811.20 : x
  2. Step 2: Convert to fraction form
    72,981.80/109,464.60 = 59,811.20/x
  3. Step 3: Cross multiply
    72,981.80x = 109,464.60 × 59,811.20
  4. Step 4: Simplify right side
    72,981.80x = 6,547,209,083.52
  5. Step 5: Solve for x
    x = 6,547,209,083.52/72,981.80
  6. Step 6: Final answer
    x = 89,710.16

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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.