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Finding the Fourth Proportional to 386,999.80, 580,499.70 and 292,521.40

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Solution

The fourth proportional to 386,999.80, 580,499.70 and 292,521.40 is: 438,782.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,999.80 : 580,499.70 = 292,521.40 : x
  2. Step 2: Convert to fraction form
    386,999.80/580,499.70 = 292,521.40/x
  3. Step 3: Cross multiply
    386,999.80x = 580,499.70 × 292,521.40
  4. Step 4: Simplify right side
    386,999.80x = 169,808,584,943.58
  5. Step 5: Solve for x
    x = 169,808,584,943.58/386,999.80
  6. Step 6: Final answer
    x = 438,782.10

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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.