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Finding the Fourth Proportional to 426,648.20, 638,417.10 and 389,323.40

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Solution

The fourth proportional to 426,648.20, 638,417.10 and 389,323.40 is: 582,565.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,648.20 : 638,417.10 = 389,323.40 : x
  2. Step 2: Convert to fraction form
    426,648.20/638,417.10 = 389,323.40/x
  3. Step 3: Cross multiply
    426,648.20x = 638,417.10 × 389,323.40
  4. Step 4: Simplify right side
    426,648.20x = 248,550,715,990.14
  5. Step 5: Solve for x
    x = 248,550,715,990.14/426,648.20
  6. Step 6: Final answer
    x = 582,565.95

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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.