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Finding the Fourth Proportional to 1,535, 2,118.30 and 836.38

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Solution

The fourth proportional to 1,535, 2,118.30 and 836.38 is: 1,154.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,535 : 2,118.30 = 836.38 : x
  2. Step 2: Convert to fraction form
    1,535/2,118.30 = 836.38/x
  3. Step 3: Cross multiply
    1,535x = 2,118.30 × 836.38
  4. Step 4: Simplify right side
    1,535x = 1,771,693.16
  5. Step 5: Solve for x
    x = 1,771,693.16/1,535
  6. Step 6: Final answer
    x = 1,154.20

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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.