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Finding the Fourth Proportional to 1,503.28, 2,074.23 and 840.05

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Solution

The fourth proportional to 1,503.28, 2,074.23 and 840.05 is: 1,159.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,503.28 : 2,074.23 = 840.05 : x
  2. Step 2: Convert to fraction form
    1,503.28/2,074.23 = 840.05/x
  3. Step 3: Cross multiply
    1,503.28x = 2,074.23 × 840.05
  4. Step 4: Simplify right side
    1,503.28x = 1,742,456.91
  5. Step 5: Solve for x
    x = 1,742,456.91/1,503.28
  6. Step 6: Final answer
    x = 1,159.10

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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.