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Finding the Fourth Proportional to 760.15, 1,049.10 and 428.69

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Solution

The fourth proportional to 760.15, 1,049.10 and 428.69 is: 591.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.15 : 1,049.10 = 428.69 : x
  2. Step 2: Convert to fraction form
    760.15/1,049.10 = 428.69/x
  3. Step 3: Cross multiply
    760.15x = 1,049.10 × 428.69
  4. Step 4: Simplify right side
    760.15x = 449,742.11
  5. Step 5: Solve for x
    x = 449,742.11/760.15
  6. Step 6: Final answer
    x = 591.65

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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.