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Finding the Fourth Proportional to 1,320.74, 1,980.93 and 346.79

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Solution

The fourth proportional to 1,320.74, 1,980.93 and 346.79 is: 520.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.74 : 1,980.93 = 346.79 : x
  2. Step 2: Convert to fraction form
    1,320.74/1,980.93 = 346.79/x
  3. Step 3: Cross multiply
    1,320.74x = 1,980.93 × 346.79
  4. Step 4: Simplify right side
    1,320.74x = 686,956.81
  5. Step 5: Solve for x
    x = 686,956.81/1,320.74
  6. Step 6: Final answer
    x = 520.13

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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.