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Finding the Fourth Proportional to 1,490.40, 2,055.38 and 930.69

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Solution

The fourth proportional to 1,490.40, 2,055.38 and 930.69 is: 1,283.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.40 : 2,055.38 = 930.69 : x
  2. Step 2: Convert to fraction form
    1,490.40/2,055.38 = 930.69/x
  3. Step 3: Cross multiply
    1,490.40x = 2,055.38 × 930.69
  4. Step 4: Simplify right side
    1,490.40x = 1,912,916.96
  5. Step 5: Solve for x
    x = 1,912,916.96/1,490.40
  6. Step 6: Final answer
    x = 1,283.49

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Double scale
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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.