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Finding the Fourth Proportional to 390,291.72, 582,139.88 and 378,478.68

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Solution

The fourth proportional to 390,291.72, 582,139.88 and 378,478.68 is: 564,520.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,291.72 : 582,139.88 = 378,478.68 : x
  2. Step 2: Convert to fraction form
    390,291.72/582,139.88 = 378,478.68/x
  3. Step 3: Cross multiply
    390,291.72x = 582,139.88 × 378,478.68
  4. Step 4: Simplify right side
    390,291.72x = 220,327,531,465.37
  5. Step 5: Solve for x
    x = 220,327,531,465.37/390,291.72
  6. Step 6: Final answer
    x = 564,520.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.