Home / 1,287.39-1,929.87-557.48

Finding the Fourth Proportional to 1,287.39, 1,929.87 and 557.48

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Solution

The fourth proportional to 1,287.39, 1,929.87 and 557.48 is: 835.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.39 : 1,929.87 = 557.48 : x
  2. Step 2: Convert to fraction form
    1,287.39/1,929.87 = 557.48/x
  3. Step 3: Cross multiply
    1,287.39x = 1,929.87 × 557.48
  4. Step 4: Simplify right side
    1,287.39x = 1,075,863.93
  5. Step 5: Solve for x
    x = 1,075,863.93/1,287.39
  6. Step 6: Final answer
    x = 835.69

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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.