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Finding the Fourth Proportional to 489,175.40, 686,420.20 and 489,175.40

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Solution

The fourth proportional to 489,175.40, 686,420.20 and 489,175.40 is: 686,420.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,175.40 : 686,420.20 = 489,175.40 : x
  2. Step 2: Convert to fraction form
    489,175.40/686,420.20 = 489,175.40/x
  3. Step 3: Cross multiply
    489,175.40x = 686,420.20 × 489,175.40
  4. Step 4: Simplify right side
    489,175.40x = 335,779,875,903.08
  5. Step 5: Solve for x
    x = 335,779,875,903.08/489,175.40
  6. Step 6: Final answer
    x = 686,420.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.