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Finding the Fourth Proportional to 1,485.90, 2,050.65 and 856.53

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Solution

The fourth proportional to 1,485.90, 2,050.65 and 856.53 is: 1,182.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.90 : 2,050.65 = 856.53 : x
  2. Step 2: Convert to fraction form
    1,485.90/2,050.65 = 856.53/x
  3. Step 3: Cross multiply
    1,485.90x = 2,050.65 × 856.53
  4. Step 4: Simplify right side
    1,485.90x = 1,756,443.24
  5. Step 5: Solve for x
    x = 1,756,443.24/1,485.90
  6. Step 6: Final answer
    x = 1,182.07

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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.