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Finding the Fourth Proportional to 661,365.42, 987,556.35 and 643,429.32

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Solution

The fourth proportional to 661,365.42, 987,556.35 and 643,429.32 is: 960,774.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,365.42 : 987,556.35 = 643,429.32 : x
  2. Step 2: Convert to fraction form
    661,365.42/987,556.35 = 643,429.32/x
  3. Step 3: Cross multiply
    661,365.42x = 987,556.35 × 643,429.32
  4. Step 4: Simplify right side
    661,365.42x = 635,422,710,742.18
  5. Step 5: Solve for x
    x = 635,422,710,742.18/661,365.42
  6. Step 6: Final answer
    x = 960,774.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.