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Finding the Fourth Proportional to 1,870.47, 2,805.01 and 620.84

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Solution

The fourth proportional to 1,870.47, 2,805.01 and 620.84 is: 931.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,870.47 : 2,805.01 = 620.84 : x
  2. Step 2: Convert to fraction form
    1,870.47/2,805.01 = 620.84/x
  3. Step 3: Cross multiply
    1,870.47x = 2,805.01 × 620.84
  4. Step 4: Simplify right side
    1,870.47x = 1,741,445.28
  5. Step 5: Solve for x
    x = 1,741,445.28/1,870.47
  6. Step 6: Final answer
    x = 931.02

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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.