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Finding the Fourth Proportional to 975.08, 1,345.38 and 712.64

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Solution

The fourth proportional to 975.08, 1,345.38 and 712.64 is: 983.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.08 : 1,345.38 = 712.64 : x
  2. Step 2: Convert to fraction form
    975.08/1,345.38 = 712.64/x
  3. Step 3: Cross multiply
    975.08x = 1,345.38 × 712.64
  4. Step 4: Simplify right side
    975.08x = 958,771.60
  5. Step 5: Solve for x
    x = 958,771.60/975.08
  6. Step 6: Final answer
    x = 983.27

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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.