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Finding the Fourth Proportional to 98,390.40, 147,585.60 and 90,787.20

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Solution

The fourth proportional to 98,390.40, 147,585.60 and 90,787.20 is: 136,180.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,390.40 : 147,585.60 = 90,787.20 : x
  2. Step 2: Convert to fraction form
    98,390.40/147,585.60 = 90,787.20/x
  3. Step 3: Cross multiply
    98,390.40x = 147,585.60 × 90,787.20
  4. Step 4: Simplify right side
    98,390.40x = 13,398,883,384.32
  5. Step 5: Solve for x
    x = 13,398,883,384.32/98,390.40
  6. Step 6: Final answer
    x = 136,180.80

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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.