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Finding the Fourth Proportional to 71,609.40, 98,865.90 and 64,870.20

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Solution

The fourth proportional to 71,609.40, 98,865.90 and 64,870.20 is: 89,561.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,609.40 : 98,865.90 = 64,870.20 : x
  2. Step 2: Convert to fraction form
    71,609.40/98,865.90 = 64,870.20/x
  3. Step 3: Cross multiply
    71,609.40x = 98,865.90 × 64,870.20
  4. Step 4: Simplify right side
    71,609.40x = 6,413,450,706.18
  5. Step 5: Solve for x
    x = 6,413,450,706.18/71,609.40
  6. Step 6: Final answer
    x = 89,561.58

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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.