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Finding the Fourth Proportional to 688.50, 1,031.13 and 526.50

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Solution

The fourth proportional to 688.50, 1,031.13 and 526.50 is: 788.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.50 : 1,031.13 = 526.50 : x
  2. Step 2: Convert to fraction form
    688.50/1,031.13 = 526.50/x
  3. Step 3: Cross multiply
    688.50x = 1,031.13 × 526.50
  4. Step 4: Simplify right side
    688.50x = 542,889.95
  5. Step 5: Solve for x
    x = 542,889.95/688.50
  6. Step 6: Final answer
    x = 788.51

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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.