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Finding the Fourth Proportional to 1,130.79, 1,695.69 and 390.47

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Solution

The fourth proportional to 1,130.79, 1,695.69 and 390.47 is: 585.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.79 : 1,695.69 = 390.47 : x
  2. Step 2: Convert to fraction form
    1,130.79/1,695.69 = 390.47/x
  3. Step 3: Cross multiply
    1,130.79x = 1,695.69 × 390.47
  4. Step 4: Simplify right side
    1,130.79x = 662,116.07
  5. Step 5: Solve for x
    x = 662,116.07/1,130.79
  6. Step 6: Final answer
    x = 585.53

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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.