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Finding the Fourth Proportional to 978.61, 1,350.47 and 530.48

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Solution

The fourth proportional to 978.61, 1,350.47 and 530.48 is: 732.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.61 : 1,350.47 = 530.48 : x
  2. Step 2: Convert to fraction form
    978.61/1,350.47 = 530.48/x
  3. Step 3: Cross multiply
    978.61x = 1,350.47 × 530.48
  4. Step 4: Simplify right side
    978.61x = 716,387.92
  5. Step 5: Solve for x
    x = 716,387.92/978.61
  6. Step 6: Final answer
    x = 732.05

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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.