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Finding the Fourth Proportional to 875.19, 1,309.64 and 643.50

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Solution

The fourth proportional to 875.19, 1,309.64 and 643.50 is: 962.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.19 : 1,309.64 = 643.50 : x
  2. Step 2: Convert to fraction form
    875.19/1,309.64 = 643.50/x
  3. Step 3: Cross multiply
    875.19x = 1,309.64 × 643.50
  4. Step 4: Simplify right side
    875.19x = 842,753.34
  5. Step 5: Solve for x
    x = 842,753.34/875.19
  6. Step 6: Final answer
    x = 962.94

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1.5x scale

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.