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Finding the Fourth Proportional to 98,438.40, 147,657.60 and 51,685.20

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Solution

The fourth proportional to 98,438.40, 147,657.60 and 51,685.20 is: 77,527.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,438.40 : 147,657.60 = 51,685.20 : x
  2. Step 2: Convert to fraction form
    98,438.40/147,657.60 = 51,685.20/x
  3. Step 3: Cross multiply
    98,438.40x = 147,657.60 × 51,685.20
  4. Step 4: Simplify right side
    98,438.40x = 7,631,712,587.52
  5. Step 5: Solve for x
    x = 7,631,712,587.52/98,438.40
  6. Step 6: Final answer
    x = 77,527.80

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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.