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Finding the Fourth Proportional to 561,680.80, 842,521.20 and 421,712.80

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Solution

The fourth proportional to 561,680.80, 842,521.20 and 421,712.80 is: 632,569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    561,680.80 : 842,521.20 = 421,712.80 : x
  2. Step 2: Convert to fraction form
    561,680.80/842,521.20 = 421,712.80/x
  3. Step 3: Cross multiply
    561,680.80x = 842,521.20 × 421,712.80
  4. Step 4: Simplify right side
    561,680.80x = 355,301,974,311.36
  5. Step 5: Solve for x
    x = 355,301,974,311.36/561,680.80
  6. Step 6: Final answer
    x = 632,569.20

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Similar ratio
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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.