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Finding the Fourth Proportional to 91,878.20, 137,809.20 and 25,312.40

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Solution

The fourth proportional to 91,878.20, 137,809.20 and 25,312.40 is: 37,966.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,878.20 : 137,809.20 = 25,312.40 : x
  2. Step 2: Convert to fraction form
    91,878.20/137,809.20 = 25,312.40/x
  3. Step 3: Cross multiply
    91,878.20x = 137,809.20 × 25,312.40
  4. Step 4: Simplify right side
    91,878.20x = 3,488,281,594.08
  5. Step 5: Solve for x
    x = 3,488,281,594.08/91,878.20
  6. Step 6: Final answer
    x = 37,966.37

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1.5x scale

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.