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Finding the Fourth Proportional to 659,438.80, 989,417.40 and 260,011.60

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Solution

The fourth proportional to 659,438.80, 989,417.40 and 260,011.60 is: 390,119.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,438.80 : 989,417.40 = 260,011.60 : x
  2. Step 2: Convert to fraction form
    659,438.80/989,417.40 = 260,011.60/x
  3. Step 3: Cross multiply
    659,438.80x = 989,417.40 × 260,011.60
  4. Step 4: Simplify right side
    659,438.80x = 257,260,001,241.84
  5. Step 5: Solve for x
    x = 257,260,001,241.84/659,438.80
  6. Step 6: Final answer
    x = 390,119.60

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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.