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Finding the Fourth Proportional to 1,088.60, 1,502.40 and 715.89

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Solution

The fourth proportional to 1,088.60, 1,502.40 and 715.89 is: 988.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,088.60 : 1,502.40 = 715.89 : x
  2. Step 2: Convert to fraction form
    1,088.60/1,502.40 = 715.89/x
  3. Step 3: Cross multiply
    1,088.60x = 1,502.40 × 715.89
  4. Step 4: Simplify right side
    1,088.60x = 1,075,553.14
  5. Step 5: Solve for x
    x = 1,075,553.14/1,088.60
  6. Step 6: Final answer
    x = 988.02

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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.