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Finding the Fourth Proportional to 876.87, 1,210.08 and 478.53

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Solution

The fourth proportional to 876.87, 1,210.08 and 478.53 is: 660.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.87 : 1,210.08 = 478.53 : x
  2. Step 2: Convert to fraction form
    876.87/1,210.08 = 478.53/x
  3. Step 3: Cross multiply
    876.87x = 1,210.08 × 478.53
  4. Step 4: Simplify right side
    876.87x = 579,061.52
  5. Step 5: Solve for x
    x = 579,061.52/876.87
  6. Step 6: Final answer
    x = 660.38

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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.