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Finding the Fourth Proportional to 690.71, 953.38 and 551.79

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Solution

The fourth proportional to 690.71, 953.38 and 551.79 is: 761.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.71 : 953.38 = 551.79 : x
  2. Step 2: Convert to fraction form
    690.71/953.38 = 551.79/x
  3. Step 3: Cross multiply
    690.71x = 953.38 × 551.79
  4. Step 4: Simplify right side
    690.71x = 526,066.55
  5. Step 5: Solve for x
    x = 526,066.55/690.71
  6. Step 6: Final answer
    x = 761.63

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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.