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Finding the Fourth Proportional to 672.15, 1,012.80 and 553.08

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Solution

The fourth proportional to 672.15, 1,012.80 and 553.08 is: 833.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.15 : 1,012.80 = 553.08 : x
  2. Step 2: Convert to fraction form
    672.15/1,012.80 = 553.08/x
  3. Step 3: Cross multiply
    672.15x = 1,012.80 × 553.08
  4. Step 4: Simplify right side
    672.15x = 560,159.42
  5. Step 5: Solve for x
    x = 560,159.42/672.15
  6. Step 6: Final answer
    x = 833.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.