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Finding the Fourth Proportional to 760.78, 1,049.89 and 429.21

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Solution

The fourth proportional to 760.78, 1,049.89 and 429.21 is: 592.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.78 : 1,049.89 = 429.21 : x
  2. Step 2: Convert to fraction form
    760.78/1,049.89 = 429.21/x
  3. Step 3: Cross multiply
    760.78x = 1,049.89 × 429.21
  4. Step 4: Simplify right side
    760.78x = 450,621.14
  5. Step 5: Solve for x
    x = 450,621.14/760.78
  6. Step 6: Final answer
    x = 592.31

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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.