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Finding the Fourth Proportional to 521,987.39, 720,308.50 and 307,085.93

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Solution

The fourth proportional to 521,987.39, 720,308.50 and 307,085.93 is: 423,758.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,987.39 : 720,308.50 = 307,085.93 : x
  2. Step 2: Convert to fraction form
    521,987.39/720,308.50 = 307,085.93/x
  3. Step 3: Cross multiply
    521,987.39x = 720,308.50 × 307,085.93
  4. Step 4: Simplify right side
    521,987.39x = 221,196,607,993.04
  5. Step 5: Solve for x
    x = 221,196,607,993.04/521,987.39
  6. Step 6: Final answer
    x = 423,758.53

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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.