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Finding the Fourth Proportional to 978,421.40, 1,467,632.10 and 418,549.40

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Solution

The fourth proportional to 978,421.40, 1,467,632.10 and 418,549.40 is: 627,824.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,421.40 : 1,467,632.10 = 418,549.40 : x
  2. Step 2: Convert to fraction form
    978,421.40/1,467,632.10 = 418,549.40/x
  3. Step 3: Cross multiply
    978,421.40x = 1,467,632.10 × 418,549.40
  4. Step 4: Simplify right side
    978,421.40x = 614,276,534,875.74
  5. Step 5: Solve for x
    x = 614,276,534,875.74/978,421.40
  6. Step 6: Final answer
    x = 627,824.10

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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.