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Finding the Fourth Proportional to 979.93, 1,465.53 and 870.94

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Solution

The fourth proportional to 979.93, 1,465.53 and 870.94 is: 1,302.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.93 : 1,465.53 = 870.94 : x
  2. Step 2: Convert to fraction form
    979.93/1,465.53 = 870.94/x
  3. Step 3: Cross multiply
    979.93x = 1,465.53 × 870.94
  4. Step 4: Simplify right side
    979.93x = 1,276,388.70
  5. Step 5: Solve for x
    x = 1,276,388.70/979.93
  6. Step 6: Final answer
    x = 1,302.53

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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.