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Finding the Fourth Proportional to 415,439.80, 623,159.70 and 134,985.40

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Solution

The fourth proportional to 415,439.80, 623,159.70 and 134,985.40 is: 202,478.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,439.80 : 623,159.70 = 134,985.40 : x
  2. Step 2: Convert to fraction form
    415,439.80/623,159.70 = 134,985.40/x
  3. Step 3: Cross multiply
    415,439.80x = 623,159.70 × 134,985.40
  4. Step 4: Simplify right side
    415,439.80x = 84,117,461,368.38
  5. Step 5: Solve for x
    x = 84,117,461,368.38/415,439.80
  6. Step 6: Final answer
    x = 202,478.10

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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.