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Finding the Fourth Proportional to 738.77, 1,019.10 and 489.74

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Solution

The fourth proportional to 738.77, 1,019.10 and 489.74 is: 675.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.77 : 1,019.10 = 489.74 : x
  2. Step 2: Convert to fraction form
    738.77/1,019.10 = 489.74/x
  3. Step 3: Cross multiply
    738.77x = 1,019.10 × 489.74
  4. Step 4: Simplify right side
    738.77x = 499,088.94
  5. Step 5: Solve for x
    x = 499,088.94/738.77
  6. Step 6: Final answer
    x = 675.57

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1.5x scale

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.