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Finding the Fourth Proportional to 687.21, 947.88 and 424.77

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Solution

The fourth proportional to 687.21, 947.88 and 424.77 is: 585.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.21 : 947.88 = 424.77 : x
  2. Step 2: Convert to fraction form
    687.21/947.88 = 424.77/x
  3. Step 3: Cross multiply
    687.21x = 947.88 × 424.77
  4. Step 4: Simplify right side
    687.21x = 402,630.99
  5. Step 5: Solve for x
    x = 402,630.99/687.21
  6. Step 6: Final answer
    x = 585.89

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Double scale
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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.