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Finding the Fourth Proportional to 1,130.65, 1,695.21 and 390.07

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Solution

The fourth proportional to 1,130.65, 1,695.21 and 390.07 is: 584.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.65 : 1,695.21 = 390.07 : x
  2. Step 2: Convert to fraction form
    1,130.65/1,695.21 = 390.07/x
  3. Step 3: Cross multiply
    1,130.65x = 1,695.21 × 390.07
  4. Step 4: Simplify right side
    1,130.65x = 661,250.56
  5. Step 5: Solve for x
    x = 661,250.56/1,130.65
  6. Step 6: Final answer
    x = 584.84

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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.