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Finding the Fourth Proportional to 235,643.60, 325,185 and 128,212.40

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Solution

The fourth proportional to 235,643.60, 325,185 and 128,212.40 is: 176,931.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,643.60 : 325,185 = 128,212.40 : x
  2. Step 2: Convert to fraction form
    235,643.60/325,185 = 128,212.40/x
  3. Step 3: Cross multiply
    235,643.60x = 325,185 × 128,212.40
  4. Step 4: Simplify right side
    235,643.60x = 41,692,749,294
  5. Step 5: Solve for x
    x = 41,692,749,294/235,643.60
  6. Step 6: Final answer
    x = 176,931.39

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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.