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Finding the Fourth Proportional to 86,640.80, 130,009.80 and 36,712.40

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Solution

The fourth proportional to 86,640.80, 130,009.80 and 36,712.40 is: 55,089.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,640.80 : 130,009.80 = 36,712.40 : x
  2. Step 2: Convert to fraction form
    86,640.80/130,009.80 = 36,712.40/x
  3. Step 3: Cross multiply
    86,640.80x = 130,009.80 × 36,712.40
  4. Step 4: Simplify right side
    86,640.80x = 4,772,971,781.52
  5. Step 5: Solve for x
    x = 4,772,971,781.52/86,640.80
  6. Step 6: Final answer
    x = 55,089.19

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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.