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Finding the Fourth Proportional to 660.05, 909.71 and 571.35

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Solution

The fourth proportional to 660.05, 909.71 and 571.35 is: 787.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.05 : 909.71 = 571.35 : x
  2. Step 2: Convert to fraction form
    660.05/909.71 = 571.35/x
  3. Step 3: Cross multiply
    660.05x = 909.71 × 571.35
  4. Step 4: Simplify right side
    660.05x = 519,762.81
  5. Step 5: Solve for x
    x = 519,762.81/660.05
  6. Step 6: Final answer
    x = 787.47

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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.