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Finding the Fourth Proportional to 665,500, 918,337.68 and 378,963.04

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Solution

The fourth proportional to 665,500, 918,337.68 and 378,963.04 is: 522,939.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,500 : 918,337.68 = 378,963.04 : x
  2. Step 2: Convert to fraction form
    665,500/918,337.68 = 378,963.04/x
  3. Step 3: Cross multiply
    665,500x = 918,337.68 × 378,963.04
  4. Step 4: Simplify right side
    665,500x = 348,016,038,959.35
  5. Step 5: Solve for x
    x = 348,016,038,959.35/665,500
  6. Step 6: Final answer
    x = 522,939.20

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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.