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Finding the Fourth Proportional to 876.51, 1,209.56 and 478.15

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Solution

The fourth proportional to 876.51, 1,209.56 and 478.15 is: 659.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.51 : 1,209.56 = 478.15 : x
  2. Step 2: Convert to fraction form
    876.51/1,209.56 = 478.15/x
  3. Step 3: Cross multiply
    876.51x = 1,209.56 × 478.15
  4. Step 4: Simplify right side
    876.51x = 578,345.70
  5. Step 5: Solve for x
    x = 578,345.70/876.51
  6. Step 6: Final answer
    x = 659.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.