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Finding the Fourth Proportional to 1,580.79, 2,180.19 and 990.57

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Solution

The fourth proportional to 1,580.79, 2,180.19 and 990.57 is: 1,366.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.79 : 2,180.19 = 990.57 : x
  2. Step 2: Convert to fraction form
    1,580.79/2,180.19 = 990.57/x
  3. Step 3: Cross multiply
    1,580.79x = 2,180.19 × 990.57
  4. Step 4: Simplify right side
    1,580.79x = 2,159,630.81
  5. Step 5: Solve for x
    x = 2,159,630.81/1,580.79
  6. Step 6: Final answer
    x = 1,366.17

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1.5x scale

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.