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Finding the Fourth Proportional to 707.18, 975.60 and 485.74

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Solution

The fourth proportional to 707.18, 975.60 and 485.74 is: 670.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.18 : 975.60 = 485.74 : x
  2. Step 2: Convert to fraction form
    707.18/975.60 = 485.74/x
  3. Step 3: Cross multiply
    707.18x = 975.60 × 485.74
  4. Step 4: Simplify right side
    707.18x = 473,887.94
  5. Step 5: Solve for x
    x = 473,887.94/707.18
  6. Step 6: Final answer
    x = 670.11

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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.