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Finding the Fourth Proportional to 426,518.40, 639,470.40 and 239,587.20

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Solution

The fourth proportional to 426,518.40, 639,470.40 and 239,587.20 is: 359,208.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,518.40 : 639,470.40 = 239,587.20 : x
  2. Step 2: Convert to fraction form
    426,518.40/639,470.40 = 239,587.20/x
  3. Step 3: Cross multiply
    426,518.40x = 639,470.40 × 239,587.20
  4. Step 4: Simplify right side
    426,518.40x = 153,208,922,618.88
  5. Step 5: Solve for x
    x = 153,208,922,618.88/426,518.40
  6. Step 6: Final answer
    x = 359,208.24

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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.