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Finding the Fourth Proportional to 978.84, 1,350.42 and 647.46

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Solution

The fourth proportional to 978.84, 1,350.42 and 647.46 is: 893.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.84 : 1,350.42 = 647.46 : x
  2. Step 2: Convert to fraction form
    978.84/1,350.42 = 647.46/x
  3. Step 3: Cross multiply
    978.84x = 1,350.42 × 647.46
  4. Step 4: Simplify right side
    978.84x = 874,342.93
  5. Step 5: Solve for x
    x = 874,342.93/978.84
  6. Step 6: Final answer
    x = 893.24

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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.