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Finding the Fourth Proportional to 875.30, 1,315.65 and 859.10

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Solution

The fourth proportional to 875.30, 1,315.65 and 859.10 is: 1,291.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.30 : 1,315.65 = 859.10 : x
  2. Step 2: Convert to fraction form
    875.30/1,315.65 = 859.10/x
  3. Step 3: Cross multiply
    875.30x = 1,315.65 × 859.10
  4. Step 4: Simplify right side
    875.30x = 1,130,274.92
  5. Step 5: Solve for x
    x = 1,130,274.92/875.30
  6. Step 6: Final answer
    x = 1,291.30

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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.