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Finding the Fourth Proportional to 628,738.64, 867,661.32 and 342,261.20

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Solution

The fourth proportional to 628,738.64, 867,661.32 and 342,261.20 is: 472,321.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,738.64 : 867,661.32 = 342,261.20 : x
  2. Step 2: Convert to fraction form
    628,738.64/867,661.32 = 342,261.20/x
  3. Step 3: Cross multiply
    628,738.64x = 867,661.32 × 342,261.20
  4. Step 4: Simplify right side
    628,738.64x = 296,966,804,576.78
  5. Step 5: Solve for x
    x = 296,966,804,576.78/628,738.64
  6. Step 6: Final answer
    x = 472,321.54

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Double scale
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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.