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Finding the Fourth Proportional to 90,953.70, 136,430.55 and 86,871.30

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Solution

The fourth proportional to 90,953.70, 136,430.55 and 86,871.30 is: 130,306.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,953.70 : 136,430.55 = 86,871.30 : x
  2. Step 2: Convert to fraction form
    90,953.70/136,430.55 = 86,871.30/x
  3. Step 3: Cross multiply
    90,953.70x = 136,430.55 × 86,871.30
  4. Step 4: Simplify right side
    90,953.70x = 11,851,899,238.22
  5. Step 5: Solve for x
    x = 11,851,899,238.22/90,953.70
  6. Step 6: Final answer
    x = 130,306.95

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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.