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Finding the Fourth Proportional to 1,239.18, 1,709.63 and 707.68

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Solution

The fourth proportional to 1,239.18, 1,709.63 and 707.68 is: 976.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.18 : 1,709.63 = 707.68 : x
  2. Step 2: Convert to fraction form
    1,239.18/1,709.63 = 707.68/x
  3. Step 3: Cross multiply
    1,239.18x = 1,709.63 × 707.68
  4. Step 4: Simplify right side
    1,239.18x = 1,209,875.23
  5. Step 5: Solve for x
    x = 1,209,875.23/1,239.18
  6. Step 6: Final answer
    x = 976.35

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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.