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Finding the Fourth Proportional to 98,639.70, 148,020.30 and 42,506.70

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Solution

The fourth proportional to 98,639.70, 148,020.30 and 42,506.70 is: 63,786.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,639.70 : 148,020.30 = 42,506.70 : x
  2. Step 2: Convert to fraction form
    98,639.70/148,020.30 = 42,506.70/x
  3. Step 3: Cross multiply
    98,639.70x = 148,020.30 × 42,506.70
  4. Step 4: Simplify right side
    98,639.70x = 6,291,854,486.01
  5. Step 5: Solve for x
    x = 6,291,854,486.01/98,639.70
  6. Step 6: Final answer
    x = 63,786.23

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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.