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Finding the Fourth Proportional to 879.71, 1,214.25 and 530.42

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Solution

The fourth proportional to 879.71, 1,214.25 and 530.42 is: 732.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.71 : 1,214.25 = 530.42 : x
  2. Step 2: Convert to fraction form
    879.71/1,214.25 = 530.42/x
  3. Step 3: Cross multiply
    879.71x = 1,214.25 × 530.42
  4. Step 4: Simplify right side
    879.71x = 644,062.49
  5. Step 5: Solve for x
    x = 644,062.49/879.71
  6. Step 6: Final answer
    x = 732.13

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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.