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Finding the Fourth Proportional to 711.07, 1,066.40 and 278.13

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Solution

The fourth proportional to 711.07, 1,066.40 and 278.13 is: 417.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.07 : 1,066.40 = 278.13 : x
  2. Step 2: Convert to fraction form
    711.07/1,066.40 = 278.13/x
  3. Step 3: Cross multiply
    711.07x = 1,066.40 × 278.13
  4. Step 4: Simplify right side
    711.07x = 296,597.83
  5. Step 5: Solve for x
    x = 296,597.83/711.07
  6. Step 6: Final answer
    x = 417.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.