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Finding the Fourth Proportional to 1,007.15, 1,389.78 and 675.51

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Solution

The fourth proportional to 1,007.15, 1,389.78 and 675.51 is: 932.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.15 : 1,389.78 = 675.51 : x
  2. Step 2: Convert to fraction form
    1,007.15/1,389.78 = 675.51/x
  3. Step 3: Cross multiply
    1,007.15x = 1,389.78 × 675.51
  4. Step 4: Simplify right side
    1,007.15x = 938,810.29
  5. Step 5: Solve for x
    x = 938,810.29/1,007.15
  6. Step 6: Final answer
    x = 932.15

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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.