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Finding the Fourth Proportional to 860.07, 1,186.94 and 487.07

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Solution

The fourth proportional to 860.07, 1,186.94 and 487.07 is: 672.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.07 : 1,186.94 = 487.07 : x
  2. Step 2: Convert to fraction form
    860.07/1,186.94 = 487.07/x
  3. Step 3: Cross multiply
    860.07x = 1,186.94 × 487.07
  4. Step 4: Simplify right side
    860.07x = 578,114.50
  5. Step 5: Solve for x
    x = 578,114.50/860.07
  6. Step 6: Final answer
    x = 672.17

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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.