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Finding the Fourth Proportional to 128,605.50, 177,475.68 and 72,018.18

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Solution

The fourth proportional to 128,605.50, 177,475.68 and 72,018.18 is: 99,385.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,605.50 : 177,475.68 = 72,018.18 : x
  2. Step 2: Convert to fraction form
    128,605.50/177,475.68 = 72,018.18/x
  3. Step 3: Cross multiply
    128,605.50x = 177,475.68 × 72,018.18
  4. Step 4: Simplify right side
    128,605.50x = 12,781,475,467.86
  5. Step 5: Solve for x
    x = 12,781,475,467.86/128,605.50
  6. Step 6: Final answer
    x = 99,385.14

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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.