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Finding the Fourth Proportional to 1,430.31, 1,973.96 and 870.65

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Solution

The fourth proportional to 1,430.31, 1,973.96 and 870.65 is: 1,201.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.31 : 1,973.96 = 870.65 : x
  2. Step 2: Convert to fraction form
    1,430.31/1,973.96 = 870.65/x
  3. Step 3: Cross multiply
    1,430.31x = 1,973.96 × 870.65
  4. Step 4: Simplify right side
    1,430.31x = 1,718,614.05
  5. Step 5: Solve for x
    x = 1,718,614.05/1,430.31
  6. Step 6: Final answer
    x = 1,201.57

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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.