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Finding the Fourth Proportional to 392,740.80, 589,111.20 and 143,390.40

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Solution

The fourth proportional to 392,740.80, 589,111.20 and 143,390.40 is: 215,085.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,740.80 : 589,111.20 = 143,390.40 : x
  2. Step 2: Convert to fraction form
    392,740.80/589,111.20 = 143,390.40/x
  3. Step 3: Cross multiply
    392,740.80x = 589,111.20 × 143,390.40
  4. Step 4: Simplify right side
    392,740.80x = 84,472,890,612.48
  5. Step 5: Solve for x
    x = 84,472,890,612.48/392,740.80
  6. Step 6: Final answer
    x = 215,085.60

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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.