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Finding the Fourth Proportional to 1,533.40, 2,115.99 and 870.21

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Solution

The fourth proportional to 1,533.40, 2,115.99 and 870.21 is: 1,200.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,533.40 : 2,115.99 = 870.21 : x
  2. Step 2: Convert to fraction form
    1,533.40/2,115.99 = 870.21/x
  3. Step 3: Cross multiply
    1,533.40x = 2,115.99 × 870.21
  4. Step 4: Simplify right side
    1,533.40x = 1,841,355.66
  5. Step 5: Solve for x
    x = 1,841,355.66/1,533.40
  6. Step 6: Final answer
    x = 1,200.83

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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.