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Finding the Fourth Proportional to 750.90, 1,036.29 and 489.67

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Solution

The fourth proportional to 750.90, 1,036.29 and 489.67 is: 675.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.90 : 1,036.29 = 489.67 : x
  2. Step 2: Convert to fraction form
    750.90/1,036.29 = 489.67/x
  3. Step 3: Cross multiply
    750.90x = 1,036.29 × 489.67
  4. Step 4: Simplify right side
    750.90x = 507,440.12
  5. Step 5: Solve for x
    x = 507,440.12/750.90
  6. Step 6: Final answer
    x = 675.78

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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.