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Finding the Fourth Proportional to 1,530.09, 2,111.40 and 970.65

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Solution

The fourth proportional to 1,530.09, 2,111.40 and 970.65 is: 1,339.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,530.09 : 2,111.40 = 970.65 : x
  2. Step 2: Convert to fraction form
    1,530.09/2,111.40 = 970.65/x
  3. Step 3: Cross multiply
    1,530.09x = 2,111.40 × 970.65
  4. Step 4: Simplify right side
    1,530.09x = 2,049,430.41
  5. Step 5: Solve for x
    x = 2,049,430.41/1,530.09
  6. Step 6: Final answer
    x = 1,339.42

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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.