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Finding the Fourth Proportional to 713.79, 985.05 and 518.16

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Solution

The fourth proportional to 713.79, 985.05 and 518.16 is: 715.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.79 : 985.05 = 518.16 : x
  2. Step 2: Convert to fraction form
    713.79/985.05 = 518.16/x
  3. Step 3: Cross multiply
    713.79x = 985.05 × 518.16
  4. Step 4: Simplify right side
    713.79x = 510,413.51
  5. Step 5: Solve for x
    x = 510,413.51/713.79
  6. Step 6: Final answer
    x = 715.08

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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.