Home / 1,535.40-2,118.86-836.78

Finding the Fourth Proportional to 1,535.40, 2,118.86 and 836.78

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Solution

The fourth proportional to 1,535.40, 2,118.86 and 836.78 is: 1,154.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,535.40 : 2,118.86 = 836.78 : x
  2. Step 2: Convert to fraction form
    1,535.40/2,118.86 = 836.78/x
  3. Step 3: Cross multiply
    1,535.40x = 2,118.86 × 836.78
  4. Step 4: Simplify right side
    1,535.40x = 1,773,009.08
  5. Step 5: Solve for x
    x = 1,773,009.08/1,535.40
  6. Step 6: Final answer
    x = 1,154.75

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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.