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Finding the Fourth Proportional to 643,559.40, 888,115.86 and 357,085.08

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Solution

The fourth proportional to 643,559.40, 888,115.86 and 357,085.08 is: 492,779.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,559.40 : 888,115.86 = 357,085.08 : x
  2. Step 2: Convert to fraction form
    643,559.40/888,115.86 = 357,085.08/x
  3. Step 3: Cross multiply
    643,559.40x = 888,115.86 × 357,085.08
  4. Step 4: Simplify right side
    643,559.40x = 317,132,922,917.37
  5. Step 5: Solve for x
    x = 317,132,922,917.37/643,559.40
  6. Step 6: Final answer
    x = 492,779.57

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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.