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Finding the Fourth Proportional to 1,304.92, 1,800.78 and 715.45

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Solution

The fourth proportional to 1,304.92, 1,800.78 and 715.45 is: 987.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,304.92 : 1,800.78 = 715.45 : x
  2. Step 2: Convert to fraction form
    1,304.92/1,800.78 = 715.45/x
  3. Step 3: Cross multiply
    1,304.92x = 1,800.78 × 715.45
  4. Step 4: Simplify right side
    1,304.92x = 1,288,368.05
  5. Step 5: Solve for x
    x = 1,288,368.05/1,304.92
  6. Step 6: Final answer
    x = 987.32

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1.5x scale

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.