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Finding the Fourth Proportional to 700.15, 1,050.78 and 387.88

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Solution

The fourth proportional to 700.15, 1,050.78 and 387.88 is: 582.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.15 : 1,050.78 = 387.88 : x
  2. Step 2: Convert to fraction form
    700.15/1,050.78 = 387.88/x
  3. Step 3: Cross multiply
    700.15x = 1,050.78 × 387.88
  4. Step 4: Simplify right side
    700.15x = 407,576.55
  5. Step 5: Solve for x
    x = 407,576.55/700.15
  6. Step 6: Final answer
    x = 582.13

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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.