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Finding the Fourth Proportional to 1,078.02, 1,615.83 and 707.40

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Solution

The fourth proportional to 1,078.02, 1,615.83 and 707.40 is: 1,060.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.02 : 1,615.83 = 707.40 : x
  2. Step 2: Convert to fraction form
    1,078.02/1,615.83 = 707.40/x
  3. Step 3: Cross multiply
    1,078.02x = 1,615.83 × 707.40
  4. Step 4: Simplify right side
    1,078.02x = 1,143,038.14
  5. Step 5: Solve for x
    x = 1,143,038.14/1,078.02
  6. Step 6: Final answer
    x = 1,060.31

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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.