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Finding the Fourth Proportional to 1,217.10, 1,678.97 and 921.86

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Solution

The fourth proportional to 1,217.10, 1,678.97 and 921.86 is: 1,271.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.10 : 1,678.97 = 921.86 : x
  2. Step 2: Convert to fraction form
    1,217.10/1,678.97 = 921.86/x
  3. Step 3: Cross multiply
    1,217.10x = 1,678.97 × 921.86
  4. Step 4: Simplify right side
    1,217.10x = 1,547,762.28
  5. Step 5: Solve for x
    x = 1,547,762.28/1,217.10
  6. Step 6: Final answer
    x = 1,271.68

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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.