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Finding the Fourth Proportional to 78,686.84, 118,031.07 and 62,991.64

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Solution

The fourth proportional to 78,686.84, 118,031.07 and 62,991.64 is: 94,488.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,686.84 : 118,031.07 = 62,991.64 : x
  2. Step 2: Convert to fraction form
    78,686.84/118,031.07 = 62,991.64/x
  3. Step 3: Cross multiply
    78,686.84x = 118,031.07 × 62,991.64
  4. Step 4: Simplify right side
    78,686.84x = 7,434,971,054.01
  5. Step 5: Solve for x
    x = 7,434,971,054.01/78,686.84
  6. Step 6: Final answer
    x = 94,488.11

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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.