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Finding the Fourth Proportional to 978.92, 1,465.32 and 612.08

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Solution

The fourth proportional to 978.92, 1,465.32 and 612.08 is: 916.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.92 : 1,465.32 = 612.08 : x
  2. Step 2: Convert to fraction form
    978.92/1,465.32 = 612.08/x
  3. Step 3: Cross multiply
    978.92x = 1,465.32 × 612.08
  4. Step 4: Simplify right side
    978.92x = 896,893.07
  5. Step 5: Solve for x
    x = 896,893.07/978.92
  6. Step 6: Final answer
    x = 916.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.