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Finding the Fourth Proportional to 1,088.72, 1,502.40 and 623.12

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Solution

The fourth proportional to 1,088.72, 1,502.40 and 623.12 is: 859.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,088.72 : 1,502.40 = 623.12 : x
  2. Step 2: Convert to fraction form
    1,088.72/1,502.40 = 623.12/x
  3. Step 3: Cross multiply
    1,088.72x = 1,502.40 × 623.12
  4. Step 4: Simplify right side
    1,088.72x = 936,175.49
  5. Step 5: Solve for x
    x = 936,175.49/1,088.72
  6. Step 6: Final answer
    x = 859.89

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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.