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Finding the Fourth Proportional to 1,490.53, 2,056.92 and 818.35

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Solution

The fourth proportional to 1,490.53, 2,056.92 and 818.35 is: 1,129.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.53 : 2,056.92 = 818.35 : x
  2. Step 2: Convert to fraction form
    1,490.53/2,056.92 = 818.35/x
  3. Step 3: Cross multiply
    1,490.53x = 2,056.92 × 818.35
  4. Step 4: Simplify right side
    1,490.53x = 1,683,270.20
  5. Step 5: Solve for x
    x = 1,683,270.20/1,490.53
  6. Step 6: Final answer
    x = 1,129.31

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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.