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Finding the Fourth Proportional to 1,130.84, 1,688.11 and 985

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Solution

The fourth proportional to 1,130.84, 1,688.11 and 985 is: 1,470.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.84 : 1,688.11 = 985 : x
  2. Step 2: Convert to fraction form
    1,130.84/1,688.11 = 985/x
  3. Step 3: Cross multiply
    1,130.84x = 1,688.11 × 985
  4. Step 4: Simplify right side
    1,130.84x = 1,662,788.35
  5. Step 5: Solve for x
    x = 1,662,788.35/1,130.84
  6. Step 6: Final answer
    x = 1,470.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.