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Finding the Fourth Proportional to 504.76, 696.60 and 280.72

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Solution

The fourth proportional to 504.76, 696.60 and 280.72 is: 387.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.76 : 696.60 = 280.72 : x
  2. Step 2: Convert to fraction form
    504.76/696.60 = 280.72/x
  3. Step 3: Cross multiply
    504.76x = 696.60 × 280.72
  4. Step 4: Simplify right side
    504.76x = 195,547.81
  5. Step 5: Solve for x
    x = 195,547.81/504.76
  6. Step 6: Final answer
    x = 387.41

Related Problems

Find fourth proportional to 252.38, 348.30 and 140.36
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Double scale
Find fourth proportional to 505.76, 697.98 and 281.72
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.