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Finding the Fourth Proportional to 1,533.99, 2,116.80 and 870.86

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Solution

The fourth proportional to 1,533.99, 2,116.80 and 870.86 is: 1,201.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,533.99 : 2,116.80 = 870.86 : x
  2. Step 2: Convert to fraction form
    1,533.99/2,116.80 = 870.86/x
  3. Step 3: Cross multiply
    1,533.99x = 2,116.80 × 870.86
  4. Step 4: Simplify right side
    1,533.99x = 1,843,425.86
  5. Step 5: Solve for x
    x = 1,843,425.86/1,533.99
  6. Step 6: Final answer
    x = 1,201.72

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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.