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Finding the Fourth Proportional to 790.64, 1,088.64 and 672.38

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Solution

The fourth proportional to 790.64, 1,088.64 and 672.38 is: 925.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.64 : 1,088.64 = 672.38 : x
  2. Step 2: Convert to fraction form
    790.64/1,088.64 = 672.38/x
  3. Step 3: Cross multiply
    790.64x = 1,088.64 × 672.38
  4. Step 4: Simplify right side
    790.64x = 731,979.76
  5. Step 5: Solve for x
    x = 731,979.76/790.64
  6. Step 6: Final answer
    x = 925.81

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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.