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Finding the Fourth Proportional to 1,810.47, 2,715.62 and 990.35

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Solution

The fourth proportional to 1,810.47, 2,715.62 and 990.35 is: 1,485.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,810.47 : 2,715.62 = 990.35 : x
  2. Step 2: Convert to fraction form
    1,810.47/2,715.62 = 990.35/x
  3. Step 3: Cross multiply
    1,810.47x = 2,715.62 × 990.35
  4. Step 4: Simplify right side
    1,810.47x = 2,689,395.74
  5. Step 5: Solve for x
    x = 2,689,395.74/1,810.47
  6. Step 6: Final answer
    x = 1,485.47

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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.