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Finding the Fourth Proportional to 103,587.80, 155,381.70 and 86,966.60

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Solution

The fourth proportional to 103,587.80, 155,381.70 and 86,966.60 is: 130,449.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,587.80 : 155,381.70 = 86,966.60 : x
  2. Step 2: Convert to fraction form
    103,587.80/155,381.70 = 86,966.60/x
  3. Step 3: Cross multiply
    103,587.80x = 155,381.70 × 86,966.60
  4. Step 4: Simplify right side
    103,587.80x = 13,513,018,151.22
  5. Step 5: Solve for x
    x = 13,513,018,151.22/103,587.80
  6. Step 6: Final answer
    x = 130,449.90

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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.