Finding the Fourth Proportional to 1,390,303.12, 1,918,459.70 and 778,370.80
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Solution
The fourth proportional to 1,390,303.12, 1,918,459.70 and 778,370.80 is: 1,074,062.91
Step by Step Solution
- Step 1: Write the proportion equation
1,390,303.12 : 1,918,459.70 = 778,370.80 : x - Step 2: Convert to fraction form
1,390,303.12/1,918,459.70 = 778,370.80/x - Step 3: Cross multiply
1,390,303.12x = 1,918,459.70 × 778,370.80 - Step 4: Simplify right side
1,390,303.12x = 1,493,273,011,456.76 - Step 5: Solve for x
x = 1,493,273,011,456.76/1,390,303.12 - Step 6: Final answer
x = 1,074,062.91
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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.