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Finding the Fourth Proportional to 1,354.40, 1,869.96 and 857.20

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Solution

The fourth proportional to 1,354.40, 1,869.96 and 857.20 is: 1,183.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.40 : 1,869.96 = 857.20 : x
  2. Step 2: Convert to fraction form
    1,354.40/1,869.96 = 857.20/x
  3. Step 3: Cross multiply
    1,354.40x = 1,869.96 × 857.20
  4. Step 4: Simplify right side
    1,354.40x = 1,602,929.71
  5. Step 5: Solve for x
    x = 1,602,929.71/1,354.40
  6. Step 6: Final answer
    x = 1,183.50

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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.