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Finding the Fourth Proportional to 438,000.20, 657,000.30 and 343,521.80

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Solution

The fourth proportional to 438,000.20, 657,000.30 and 343,521.80 is: 515,282.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,000.20 : 657,000.30 = 343,521.80 : x
  2. Step 2: Convert to fraction form
    438,000.20/657,000.30 = 343,521.80/x
  3. Step 3: Cross multiply
    438,000.20x = 657,000.30 × 343,521.80
  4. Step 4: Simplify right side
    438,000.20x = 225,693,925,656.54
  5. Step 5: Solve for x
    x = 225,693,925,656.54/438,000.20
  6. Step 6: Final answer
    x = 515,282.70

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1.5x scale

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.