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Finding the Fourth Proportional to 90,438.78, 124,661.70 and 71,287.50

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Solution

The fourth proportional to 90,438.78, 124,661.70 and 71,287.50 is: 98,263.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,438.78 : 124,661.70 = 71,287.50 : x
  2. Step 2: Convert to fraction form
    90,438.78/124,661.70 = 71,287.50/x
  3. Step 3: Cross multiply
    90,438.78x = 124,661.70 × 71,287.50
  4. Step 4: Simplify right side
    90,438.78x = 8,886,820,938.75
  5. Step 5: Solve for x
    x = 8,886,820,938.75/90,438.78
  6. Step 6: Final answer
    x = 98,263.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.