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Finding the Fourth Proportional to 1,125.51, 1,686.51 and 578.22

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Solution

The fourth proportional to 1,125.51, 1,686.51 and 578.22 is: 866.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.51 : 1,686.51 = 578.22 : x
  2. Step 2: Convert to fraction form
    1,125.51/1,686.51 = 578.22/x
  3. Step 3: Cross multiply
    1,125.51x = 1,686.51 × 578.22
  4. Step 4: Simplify right side
    1,125.51x = 975,173.81
  5. Step 5: Solve for x
    x = 975,173.81/1,125.51
  6. Step 6: Final answer
    x = 866.43

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1.5x scale

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.