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Finding the Fourth Proportional to 1,038.30, 1,431.48 and 860.60

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Solution

The fourth proportional to 1,038.30, 1,431.48 and 860.60 is: 1,186.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.30 : 1,431.48 = 860.60 : x
  2. Step 2: Convert to fraction form
    1,038.30/1,431.48 = 860.60/x
  3. Step 3: Cross multiply
    1,038.30x = 1,431.48 × 860.60
  4. Step 4: Simplify right side
    1,038.30x = 1,231,931.69
  5. Step 5: Solve for x
    x = 1,231,931.69/1,038.30
  6. Step 6: Final answer
    x = 1,186.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.