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Finding the Fourth Proportional to 1,985.42, 2,979.58 and 945.70

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Solution

The fourth proportional to 1,985.42, 2,979.58 and 945.70 is: 1,419.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.42 : 2,979.58 = 945.70 : x
  2. Step 2: Convert to fraction form
    1,985.42/2,979.58 = 945.70/x
  3. Step 3: Cross multiply
    1,985.42x = 2,979.58 × 945.70
  4. Step 4: Simplify right side
    1,985.42x = 2,817,788.81
  5. Step 5: Solve for x
    x = 2,817,788.81/1,985.42
  6. Step 6: Final answer
    x = 1,419.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.