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Finding the Fourth Proportional to 1,005.39, 1,508.07 and 870.06

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Solution

The fourth proportional to 1,005.39, 1,508.07 and 870.06 is: 1,305.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.39 : 1,508.07 = 870.06 : x
  2. Step 2: Convert to fraction form
    1,005.39/1,508.07 = 870.06/x
  3. Step 3: Cross multiply
    1,005.39x = 1,508.07 × 870.06
  4. Step 4: Simplify right side
    1,005.39x = 1,312,111.38
  5. Step 5: Solve for x
    x = 1,312,111.38/1,005.39
  6. Step 6: Final answer
    x = 1,305.08

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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.