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Finding the Fourth Proportional to 630.86, 870.65 and 453.77

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Solution

The fourth proportional to 630.86, 870.65 and 453.77 is: 626.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.86 : 870.65 = 453.77 : x
  2. Step 2: Convert to fraction form
    630.86/870.65 = 453.77/x
  3. Step 3: Cross multiply
    630.86x = 870.65 × 453.77
  4. Step 4: Simplify right side
    630.86x = 395,073.19
  5. Step 5: Solve for x
    x = 395,073.19/630.86
  6. Step 6: Final answer
    x = 626.25

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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.