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Finding the Fourth Proportional to 708.16, 1,061.28 and 623.68

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Solution

The fourth proportional to 708.16, 1,061.28 and 623.68 is: 934.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.16 : 1,061.28 = 623.68 : x
  2. Step 2: Convert to fraction form
    708.16/1,061.28 = 623.68/x
  3. Step 3: Cross multiply
    708.16x = 1,061.28 × 623.68
  4. Step 4: Simplify right side
    708.16x = 661,899.11
  5. Step 5: Solve for x
    x = 661,899.11/708.16
  6. Step 6: Final answer
    x = 934.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.