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Finding the Fourth Proportional to 1,554.69, 2,145.51 and 856.07

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Solution

The fourth proportional to 1,554.69, 2,145.51 and 856.07 is: 1,181.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,554.69 : 2,145.51 = 856.07 : x
  2. Step 2: Convert to fraction form
    1,554.69/2,145.51 = 856.07/x
  3. Step 3: Cross multiply
    1,554.69x = 2,145.51 × 856.07
  4. Step 4: Simplify right side
    1,554.69x = 1,836,691.74
  5. Step 5: Solve for x
    x = 1,836,691.74/1,554.69
  6. Step 6: Final answer
    x = 1,181.39

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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.