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Finding the Fourth Proportional to 86,726.70, 130,003.65 and 39,897.90

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Solution

The fourth proportional to 86,726.70, 130,003.65 and 39,897.90 is: 59,807.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,726.70 : 130,003.65 = 39,897.90 : x
  2. Step 2: Convert to fraction form
    86,726.70/130,003.65 = 39,897.90/x
  3. Step 3: Cross multiply
    86,726.70x = 130,003.65 × 39,897.90
  4. Step 4: Simplify right side
    86,726.70x = 5,186,872,627.34
  5. Step 5: Solve for x
    x = 5,186,872,627.34/86,726.70
  6. Step 6: Final answer
    x = 59,807.10

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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.