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Finding the Fourth Proportional to 1,167.32, 1,610.94 and 643.40

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Solution

The fourth proportional to 1,167.32, 1,610.94 and 643.40 is: 887.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.32 : 1,610.94 = 643.40 : x
  2. Step 2: Convert to fraction form
    1,167.32/1,610.94 = 643.40/x
  3. Step 3: Cross multiply
    1,167.32x = 1,610.94 × 643.40
  4. Step 4: Simplify right side
    1,167.32x = 1,036,478.80
  5. Step 5: Solve for x
    x = 1,036,478.80/1,167.32
  6. Step 6: Final answer
    x = 887.91

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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.