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Finding the Fourth Proportional to 634.76, 875.12 and 485.47

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Solution

The fourth proportional to 634.76, 875.12 and 485.47 is: 669.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.76 : 875.12 = 485.47 : x
  2. Step 2: Convert to fraction form
    634.76/875.12 = 485.47/x
  3. Step 3: Cross multiply
    634.76x = 875.12 × 485.47
  4. Step 4: Simplify right side
    634.76x = 424,839.89
  5. Step 5: Solve for x
    x = 424,839.89/634.76
  6. Step 6: Final answer
    x = 669.30

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Find fourth proportional to 317.38, 437.56 and 242.73
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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.