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Finding the Fourth Proportional to 1,238.61, 1,708.80 and 707.35

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Solution

The fourth proportional to 1,238.61, 1,708.80 and 707.35 is: 975.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.61 : 1,708.80 = 707.35 : x
  2. Step 2: Convert to fraction form
    1,238.61/1,708.80 = 707.35/x
  3. Step 3: Cross multiply
    1,238.61x = 1,708.80 × 707.35
  4. Step 4: Simplify right side
    1,238.61x = 1,208,715.96
  5. Step 5: Solve for x
    x = 1,208,715.96/1,238.61
  6. Step 6: Final answer
    x = 975.87

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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.