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Finding the Fourth Proportional to 1,376.06, 1,899.65 and 816.75

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Solution

The fourth proportional to 1,376.06, 1,899.65 and 816.75 is: 1,127.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.06 : 1,899.65 = 816.75 : x
  2. Step 2: Convert to fraction form
    1,376.06/1,899.65 = 816.75/x
  3. Step 3: Cross multiply
    1,376.06x = 1,899.65 × 816.75
  4. Step 4: Simplify right side
    1,376.06x = 1,551,541.18
  5. Step 5: Solve for x
    x = 1,551,541.18/1,376.06
  6. Step 6: Final answer
    x = 1,127.53

Related Problems

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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.