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Finding the Fourth Proportional to 1,140.94, 1,574.54 and 643.67

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Solution

The fourth proportional to 1,140.94, 1,574.54 and 643.67 is: 888.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.94 : 1,574.54 = 643.67 : x
  2. Step 2: Convert to fraction form
    1,140.94/1,574.54 = 643.67/x
  3. Step 3: Cross multiply
    1,140.94x = 1,574.54 × 643.67
  4. Step 4: Simplify right side
    1,140.94x = 1,013,484.16
  5. Step 5: Solve for x
    x = 1,013,484.16/1,140.94
  6. Step 6: Final answer
    x = 888.29

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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.