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Finding the Fourth Proportional to 1,121.86, 1,547.80 and 624.40

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Solution

The fourth proportional to 1,121.86, 1,547.80 and 624.40 is: 861.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.86 : 1,547.80 = 624.40 : x
  2. Step 2: Convert to fraction form
    1,121.86/1,547.80 = 624.40/x
  3. Step 3: Cross multiply
    1,121.86x = 1,547.80 × 624.40
  4. Step 4: Simplify right side
    1,121.86x = 966,446.32
  5. Step 5: Solve for x
    x = 966,446.32/1,121.86
  6. Step 6: Final answer
    x = 861.47

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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.