Home / 728,570,019.16-1,005,434,603.58-398,545,161.40

Finding the Fourth Proportional to 728,570,019.16, 1,005,434,603.58 and 398,545,161.40

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Solution

The fourth proportional to 728,570,019.16, 1,005,434,603.58 and 398,545,161.40 is: 549,996,686.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    728,570,019.16 : 1,005,434,603.58 = 398,545,161.40 : x
  2. Step 2: Convert to fraction form
    728,570,019.16/1,005,434,603.58 = 398,545,161.40/x
  3. Step 3: Cross multiply
    728,570,019.16x = 1,005,434,603.58 × 398,545,161.40
  4. Step 4: Simplify right side
    728,570,019.16x = 400,711,096,360,936,128
  5. Step 5: Solve for x
    x = 400,711,096,360,936,128/728,570,019.16
  6. Step 6: Final answer
    x = 549,996,686.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.