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Finding the Fourth Proportional to 518,642.80, 778,547.40 and 400,836.40

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Solution

The fourth proportional to 518,642.80, 778,547.40 and 400,836.40 is: 601,705.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,642.80 : 778,547.40 = 400,836.40 : x
  2. Step 2: Convert to fraction form
    518,642.80/778,547.40 = 400,836.40/x
  3. Step 3: Cross multiply
    518,642.80x = 778,547.40 × 400,836.40
  4. Step 4: Simplify right side
    518,642.80x = 312,070,137,045.36
  5. Step 5: Solve for x
    x = 312,070,137,045.36/518,642.80
  6. Step 6: Final answer
    x = 601,705.33

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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.