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Finding the Fourth Proportional to 645,779.40, 968,669.88 and 308,740.80

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Solution

The fourth proportional to 645,779.40, 968,669.88 and 308,740.80 is: 463,111.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,779.40 : 968,669.88 = 308,740.80 : x
  2. Step 2: Convert to fraction form
    645,779.40/968,669.88 = 308,740.80/x
  3. Step 3: Cross multiply
    645,779.40x = 968,669.88 × 308,740.80
  4. Step 4: Simplify right side
    645,779.40x = 299,067,913,687.10
  5. Step 5: Solve for x
    x = 299,067,913,687.10/645,779.40
  6. Step 6: Final answer
    x = 463,111.57

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Double scale
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Similar ratio
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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.