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Finding the Fourth Proportional to 255,280.80, 382,921.20 and 143,306.40

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Solution

The fourth proportional to 255,280.80, 382,921.20 and 143,306.40 is: 214,959.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,280.80 : 382,921.20 = 143,306.40 : x
  2. Step 2: Convert to fraction form
    255,280.80/382,921.20 = 143,306.40/x
  3. Step 3: Cross multiply
    255,280.80x = 382,921.20 × 143,306.40
  4. Step 4: Simplify right side
    255,280.80x = 54,875,058,655.68
  5. Step 5: Solve for x
    x = 54,875,058,655.68/255,280.80
  6. Step 6: Final answer
    x = 214,959.60

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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.