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Finding the Fourth Proportional to 1,720.84, 2,374.80 and 974.91

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Solution

The fourth proportional to 1,720.84, 2,374.80 and 974.91 is: 1,345.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.84 : 2,374.80 = 974.91 : x
  2. Step 2: Convert to fraction form
    1,720.84/2,374.80 = 974.91/x
  3. Step 3: Cross multiply
    1,720.84x = 2,374.80 × 974.91
  4. Step 4: Simplify right side
    1,720.84x = 2,315,204.39
  5. Step 5: Solve for x
    x = 2,315,204.39/1,720.84
  6. Step 6: Final answer
    x = 1,345.40

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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.