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Finding the Fourth Proportional to 87,020.70, 130,421.70 and 42,551.70

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Solution

The fourth proportional to 87,020.70, 130,421.70 and 42,551.70 is: 63,774.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,020.70 : 130,421.70 = 42,551.70 : x
  2. Step 2: Convert to fraction form
    87,020.70/130,421.70 = 42,551.70/x
  3. Step 3: Cross multiply
    87,020.70x = 130,421.70 × 42,551.70
  4. Step 4: Simplify right side
    87,020.70x = 5,549,665,051.89
  5. Step 5: Solve for x
    x = 5,549,665,051.89/87,020.70
  6. Step 6: Final answer
    x = 63,774.08

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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.