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Finding the Fourth Proportional to 1,386.92, 1,913.10 and 945.02

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Solution

The fourth proportional to 1,386.92, 1,913.10 and 945.02 is: 1,303.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.92 : 1,913.10 = 945.02 : x
  2. Step 2: Convert to fraction form
    1,386.92/1,913.10 = 945.02/x
  3. Step 3: Cross multiply
    1,386.92x = 1,913.10 × 945.02
  4. Step 4: Simplify right side
    1,386.92x = 1,807,917.76
  5. Step 5: Solve for x
    x = 1,807,917.76/1,386.92
  6. Step 6: Final answer
    x = 1,303.55

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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.