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Finding the Fourth Proportional to 85,364.90, 128,047.35 and 57,298.40

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Solution

The fourth proportional to 85,364.90, 128,047.35 and 57,298.40 is: 85,947.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,364.90 : 128,047.35 = 57,298.40 : x
  2. Step 2: Convert to fraction form
    85,364.90/128,047.35 = 57,298.40/x
  3. Step 3: Cross multiply
    85,364.90x = 128,047.35 × 57,298.40
  4. Step 4: Simplify right side
    85,364.90x = 7,336,908,279.24
  5. Step 5: Solve for x
    x = 7,336,908,279.24/85,364.90
  6. Step 6: Final answer
    x = 85,947.60

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1.5x scale

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.