Home / 1,390.34-1,917.10-1,137.47

Finding the Fourth Proportional to 1,390.34, 1,917.10 and 1,137.47

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Solution

The fourth proportional to 1,390.34, 1,917.10 and 1,137.47 is: 1,568.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.34 : 1,917.10 = 1,137.47 : x
  2. Step 2: Convert to fraction form
    1,390.34/1,917.10 = 1,137.47/x
  3. Step 3: Cross multiply
    1,390.34x = 1,917.10 × 1,137.47
  4. Step 4: Simplify right side
    1,390.34x = 2,180,643.74
  5. Step 5: Solve for x
    x = 2,180,643.74/1,390.34
  6. Step 6: Final answer
    x = 1,568.42

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Half scale
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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.