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Finding the Fourth Proportional to 687.51, 948.72 and 392.76

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Solution

The fourth proportional to 687.51, 948.72 and 392.76 is: 541.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.51 : 948.72 = 392.76 : x
  2. Step 2: Convert to fraction form
    687.51/948.72 = 392.76/x
  3. Step 3: Cross multiply
    687.51x = 948.72 × 392.76
  4. Step 4: Simplify right side
    687.51x = 372,619.27
  5. Step 5: Solve for x
    x = 372,619.27/687.51
  6. Step 6: Final answer
    x = 541.98

Related Problems

Find fourth proportional to 343.76, 474.36 and 196.38
Half scale
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Double scale
Find fourth proportional to 688.51, 950.10 and 393.76
Similar ratio
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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.