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Finding the Fourth Proportional to 1,357.48, 2,038.53 and 840.53

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Solution

The fourth proportional to 1,357.48, 2,038.53 and 840.53 is: 1,262.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.48 : 2,038.53 = 840.53 : x
  2. Step 2: Convert to fraction form
    1,357.48/2,038.53 = 840.53/x
  3. Step 3: Cross multiply
    1,357.48x = 2,038.53 × 840.53
  4. Step 4: Simplify right side
    1,357.48x = 1,713,445.62
  5. Step 5: Solve for x
    x = 1,713,445.62/1,357.48
  6. Step 6: Final answer
    x = 1,262.23

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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.