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Finding the Fourth Proportional to 647,654.40, 971,020.80 and 248,140.80

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Solution

The fourth proportional to 647,654.40, 971,020.80 and 248,140.80 is: 372,034.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,654.40 : 971,020.80 = 248,140.80 : x
  2. Step 2: Convert to fraction form
    647,654.40/971,020.80 = 248,140.80/x
  3. Step 3: Cross multiply
    647,654.40x = 971,020.80 × 248,140.80
  4. Step 4: Simplify right side
    647,654.40x = 240,949,878,128.64
  5. Step 5: Solve for x
    x = 240,949,878,128.64/647,654.40
  6. Step 6: Final answer
    x = 372,034.65

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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.