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Finding the Fourth Proportional to 426,708.16, 640,054.32 and 127,391.68

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Solution

The fourth proportional to 426,708.16, 640,054.32 and 127,391.68 is: 191,085.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,708.16 : 640,054.32 = 127,391.68 : x
  2. Step 2: Convert to fraction form
    426,708.16/640,054.32 = 127,391.68/x
  3. Step 3: Cross multiply
    426,708.16x = 640,054.32 × 127,391.68
  4. Step 4: Simplify right side
    426,708.16x = 81,537,595,116.06
  5. Step 5: Solve for x
    x = 81,537,595,116.06/426,708.16
  6. Step 6: Final answer
    x = 191,085.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.